Significant figure seen in piece of currency I promoted (4)
I believe the answer is:
icon
'significant figure' is the definition.
'icon' can be an answer for 'figure' (I've seen this before). I'm unsure of the 'significant' bit.
'piece of currency i promoted' is the wordplay.
'piece' becomes 'n' (abbreviation for Knight in chess notation).
'of' becomes 'o''.
'currency i' becomes 'ci' (this might be a standard abbreviation which I don't know about).
'promoted' is a reversal indicator (going up, in a down clue).
'n'+'o'+'ci'='noci'
'noci' reversed gives 'ICON'.
'seen in' is the link.
Can you help me to learn more?
(Other definitions for icon that I've seen before include "Image of a religious figure" , "Religious image or computer symbol" , "Religious painting or symbol on computer screen" , "Admired figure" , "A sacred painting or mosiac" .)